always use significant figure rules. remember that these rules apply to all numbers that are measurements. a…

always use significant figure rules. remember that these rules apply to all numbers that are measurements. a car travels from city a to city b to the east. it takes 2 hours, and the road mileage is 100 miles. the map shows that the cities are only 80 miles apart (straight - line distance). calculate the average velocity.

always use significant figure rules. remember that these rules apply to all numbers that are measurements. a car travels from city a to city b to the east. it takes 2 hours, and the road mileage is 100 miles. the map shows that the cities are only 80 miles apart (straight - line distance). calculate the average velocity.

Answer

Explicación:

Paso 1: Identificar la fórmula de velocidad promedio

La velocidad promedio $\vec{v}$ se define como $\vec{v}=\frac{\Delta\vec{x}}{t}$, donde $\Delta\vec{x}$ es el desplazamiento (distancia recta - línea) y $t$ es el tiempo transcurrido.

Paso 2: Sustituir valores dados

El desplazamiento $\Delta\vec{x} = 80$ millas (distancia recta - línea entre ciudades) y $t = 2$ horas. Entonces $\vec{v}=\frac{80\ \text{millas}}{2\ \text{horas}}$.

Paso 3: Calcular el resultado

$\vec{v}=40$ millas por hora (mph) y como el coche viaja hacia el este, la dirección es este (E).

Respuesta:

40 mph, E